Buggy code:
public class TestIndexWriter extends LuceneTestCase { private static final FieldType storedTextType = new FieldType ( TextField . TYPE_NOT_STORED ) ; public void testDocCount ( ) throws IOException { } static void addDoc ( IndexWriter writer ) throws IOException { } static void addDocWithIndex ( IndexWriter writer , int index ) throws IOException { } public static void assertNoUnreferencedFiles ( Directory dir , String message ) throws IOException { } static String arrayToString ( String [ ] l ) { } public void testCreateWithReader ( ) throws IOException { } public void testChangesAfterClose ( ) throws IOException { } public void testIndexNoDocuments ( ) throws IOException { } public void testManyFields ( ) throws IOException { } public void testSmallRAMBuffer ( ) throws IOException { } public void testChangingRAMBuffer ( ) throws IOException { } public void testChangingRAMBuffer2 ( ) throws IOException { } public void testDiverseDocs ( ) throws IOException { } public void testEnablingNorms ( ) throws IOException { } public void testHighFreqTerm ( ) throws IOException { } public void testNullLockFactory ( ) throws IOException { } public void testFlushWithNoMerging ( ) throws IOException { } public void testEmptyDocAfterFlushingRealDoc ( ) throws IOException { } public void testBadSegment ( ) throws IOException { } public void testMaxThreadPriority ( ) throws IOException { } public void testVariableSchema ( ) throws Exception { } public void testUnlimitedMaxFieldLength ( ) throws IOException { } public void testEmptyFieldName ( ) throws IOException { } public void testEmptyFieldNameTerms ( ) throws IOException { } public void testEmptyFieldNameWithEmptyTerm ( ) throws IOException { } private static final class MockIndexWriter extends IndexWriter { public MockIndexWriter ( Directory dir , IndexWriterConfig conf ) throws IOException { } boolean afterWasCalled ; boolean beforeWasCalled ; @ Override public void doAfterFlush ( ) { } @ Override protected void doBeforeFlush ( ) { } } public void testDoBeforeAfterFlush ( ) throws IOException { } public void testNegativePositions ( ) throws Throwable { } public void testBinaryFieldOffsetLength ( ) throws IOException { } public void testPositionIncrementGapEmptyField ( ) throws Exception { } public void testDeadlock ( ) throws Exception { } private class IndexerThreadInterrupt extends Thread { volatile boolean failed ; volatile boolean finish ; volatile boolean allowInterrupt = false ; @ Override public void run ( ) { } } public void testThreadInterruptDeadlock ( ) throws Exception { TestIndexWriter . IndexerThreadInterrupt t = new TestIndexWriter . IndexerThreadInterrupt ( ) ; t . setDaemon ( true ) ; t . start ( ) ; assertTrue ( ( ( new ThreadInterruptedException ( new InterruptedException ( ) ) . getCause ( ) ) instanceof InterruptedException ) ) ; <START_BUG> final int numInterrupts = atLeast ( 3000 ) ; <END_BUG> int i = 0 ; while ( i < numInterrupts ) { Thread . sleep ( 10 ) ; if ( t . allowInterrupt ) { i ++ ; t . interrupt ( ) ; } if ( ! ( t . isAlive ( ) ) ) { break ; } } t . finish = true ; t . join ( ) ; assertFalse ( t . failed ) ; } public void testIndexStoreCombos ( ) throws Exception { } public void testStoredFieldsOrder ( ) throws Throwable { } public void testNoDocsIndex ( ) throws Throwable { } public void testIndexDivisor ( ) throws Exception { } public void testDeleteUnusedFiles ( ) throws Exception { } public void testDeleteUnsedFiles2 ( ) throws Exception { } public void testEmptyFSDirWithNoLock ( ) throws Exception { } public void testEmptyDirRollback ( ) throws Exception { } public void testNoSegmentFile ( ) throws IOException { } public void testNoUnwantedTVFiles ( ) throws Exception { } static final class StringSplitAnalyzer extends Analyzer { @ Override public TokenStreamComponents createComponents ( String fieldName , Reader reader ) { } } private static class StringSplitTokenizer extends Tokenizer { private String [ ] tokens ; private int upto ; private final CharTermAttribute termAtt = addAttribute ( CharTermAttribute . class ) ; public StringSplitTokenizer ( Reader r ) { } @ Override public final boolean incrementToken ( ) { } @ Override public void reset ( ) throws IOException { } } public void testWickedLongTerm ( ) throws IOException { } public void testEmptyFieldNameTIIOne ( ) throws IOException { } public void testDeleteAllNRTLeftoverFiles ( ) throws Exception { } public void testNRTReaderVersion ( ) throws Exception { } public void testWhetherDeleteAllDeletesWriteLock ( ) throws Exception { } public void testChangeIndexOptions ( ) throws Exception { } public void testOnlyUpdateDocuments ( ) throws Exception { } public void testPrepareCommitThenClose ( ) throws Exception { } public void testPrepareCommitThenRollback ( ) throws Exception { } public void testPrepareCommitThenRollback2 ( ) throws Exception { } public void testDontInvokeAnalyzerForUnAnalyzedFields ( ) throws Exception { } public void testOtherFiles ( ) throws Throwable { } public void testOtherFiles2 ( ) throws Throwable { } public void testRotatingFieldNames ( ) throws Exception { } public void testCommitWithUserDataOnly ( ) throws Exception { } @ Test public void testGetCommitData ( ) throws Exception { } public void testIterableThrowsException ( ) throws IOException { } private static class RandomFailingFieldIterable implements Iterable < IndexDocument > { private final List < ? extends IndexDocument > docList ; private final Random random ; public RandomFailingFieldIterable ( List < ? extends IndexDocument > docList , Random random ) { } @ Override public Iterator < IndexDocument > iterator ( ) { } } }

Fix:
final int numInterrupts = atLeast ( 300 ) ;